.content_title {
    font-family: 微软雅黑;
    height: 30px;
    font-size: 18px;
    color: #454545;
    line-height: 30px;
    padding-left: 20px;
    padding-right: 20px;
    font-weight: bold;
}

.time {
    float: right;
    font-size: 16px;
    margin-right: 20px;
    color: #999;
    margin-bottom: 10px;
}

.content_video {
    width: 90%;
    height: 180px;
    margin-bottom: 15px;
    margin-top: 20px;
    margin-left: 5%;
}

.introduce {
    margin-bottom: 10px;
    font-size: 16px;
    font-family: 微软雅黑;
    text-indent: 2em;
    line-height: 30px;
    padding: 10px;
    color: #454545;
}